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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of Manganese(II) Acetylacetonate
Published on: June 18, 2020
Controlled synthesis of Mn3O4 nanoparticles in ionic liquids
Roberta Bussamara1, Wellington W M Melo, Jackson D Scholten
1Laboratório de Catálise Molecular (LCM), Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil. jairton.dupont@ufrgs.br.
Dalton Transactions (Cambridge, England : 2003)
|August 24, 2013
Summary
Ionic liquids facilitate the synthesis of smaller, well-dispersed manganese oxide (Mn3O4) nanoparticles. Reaction conditions and solvent choice significantly impact nanoparticle size and phase purity.
Area of Science:
- Materials Science
- Nanotechnology
- Inorganic Chemistry
Background:
- Manganese oxide nanoparticles (Mn3O4) are versatile materials with applications in catalysis, energy storage, and biomedicine.
- Controlling nanoparticle size, morphology, and phase purity is crucial for optimizing their properties.
- Conventional synthesis methods often involve harsh conditions or limited control over nanoparticle characteristics.
Purpose of the Study:
- To develop a simple, one-step synthesis for Mn3O4 nanoparticles.
- To investigate the influence of imidazolium ionic liquids (ILs) versus a conventional solvent (oleylamine) on nanoparticle formation.
- To characterize the synthesized Mn3O4 nanoparticles and evaluate their magnetic properties.
Main Methods:
- Thermal decomposition of manganese acetylacetonate ([Mn(acac)2]) in 1-n-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (BMI·NTf2) ionic liquid.
- Comparison with synthesis using oleylamine as a solvent.
- Characterization using X-ray Diffraction (XRD), Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR), Transmission Electron Microscopy (TEM), Raman Spectroscopy, UV/Visible Spectroscopy, and magnetometry.
Main Results:
- Synthesis in BMI·NTf2 IL yielded smaller (9.9 ± 1.8 nm) and more uniformly dispersed Mn3O4 nanoparticles compared to oleylamine (12.1 ± 3.0 nm).
- Complete precursor conversion to Mn3O4 was achieved in BMI·NTf2 after 96 h at 180 °C.
- Oleylamine synthesis resulted in a mixture of Mn3O4 and MnO2 phases under similar conditions.
- Synthesized Mn3O4 nanoparticles exhibited ferrimagnetic behavior at low temperatures, transitioning to paramagnetic at room temperature, with size-dependent blocking temperatures and coercivity.
Conclusions:
- Imidazolium ionic liquids offer a superior medium for synthesizing well-defined Mn3O4 nanoparticles.
- Reaction time and the choice of solvent (IL vs. conventional) are critical factors influencing Mn3O4 nanoparticle size and phase composition.
- The magnetic properties of Mn3O4 nanoparticles are directly correlated with their size.
